Day: July 28, 2021

How to Install and Configure Prometheus Alert Manager on Ubuntu 20.04 LTS

Prometheus Alert Manager is used to send alerts via email and other web services (i.e., PagerDuty, Slack, GitLab, WeChat) depending on the alert events generated on Prometheus. Prometheus can generate alerts when a target is unavailable and send them to the Alert Manager, sending you an email notification to let you know that a target …

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Ubuntu JPG to PDF Conversion Process (includes OCR Function)

This tutorial shows how to convert jpg and other image types to PDF, including the OCR function on Debian-based Linux distributions such as Ubuntu. After reading this tutorial, you’ll know how to convert images to PDF using GUI and a command-line interface. The graphical way allows you to implement the OCR function, extracting images from …

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How to install and use ADB and Fastboot on Ubuntu

ADB (Android Debug Bridge) and Fastboot allow us to manage Android mobile devices from the computer. After reading this tutorial, you’ll know how to install and use ADB and Fastboot to control your Android cell phone. Getting started: Installing ADB, Fastboot, and getting your Android device ready Before starting, you need to enable your phone …

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How to prevent a Linux system user from logging into the system

The shell setting in /etc/passwd determines whether a Linux system user may log in via the shell or over SSH. If you don’t want a certain user to be able to log in, set the shell to /bin/false or /sbin/nologin. For the user “otheruser” on Debian and Ubuntu Linux, here’s an example: usermod -s /bin/false …

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